Low-temperature extraction system for industrial production of water-soluble benzophenone-based ultraviolet absorbers

Abstract

This application relates to the field of ultraviolet absorber production technology, and in particular to a low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers. The system includes a mixture storage tank, a pump, a feed pipe, a sealed box, a separator, a telescopic sleeve, an oscillation assembly, a distillation recovery assembly, and a quantitative weighing assembly. One side of the mixture storage tank is connected to the input end of the pump. The feed pipe is installed outside the output end of the pump and extends into the top inner side of the sealed box. The quantitative weighing assembly is installed at the lower end of the feed pipe's outlet. The telescopic sleeve is installed at the lower end of the quantitative weighing assembly. The separator is fitted inside the telescopic sleeve. The oscillation assembly is snapped onto the outside of the separator. The distillation recovery assembly is installed at the lower end of the telescopic sleeve. This system can mechanically and automatically oscillate while effectively preventing workers from inhaling ether. The added ether distillation recovery structure allows clean ether to flow back into the separator, achieving the purpose of ether separation, recycling, and reuse.

Description

Technical Field

[0001] This application relates to the field of ultraviolet absorber production technology, and in particular to a low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers. Background Technology

[0002] Benzophenone compounds are widely used in pharmaceuticals, pesticides, dyes, plastics, coatings, daily chemicals, and electronic chemicals due to their simple synthesis, low cost, and excellent performance. Among all these applications, benzophenone-based ultraviolet (UV) absorbers are the most widely used. As the destruction of the Earth's ozone layer worsens, UV radiation is becoming increasingly intense, making UV absorbers an indispensable functional additive in various polymer materials and skincare products. Benzophenone-based UV absorbers strongly absorb UV light in the 270-330 nm wavelength range and are used in various plastics, such as polyethylene, polypropylene, polystyrene, ABS resin, polycarbonate, polyvinyl chloride, polyester, and epoxy resin. Waterborne benzophenone-based UV absorbers are colorless, odorless, highly efficient, and exhibit excellent water solubility over a wide pH range, attracting widespread research attention. Currently, the main method to enhance water solubility is by introducing hydrophilic groups such as quaternary ammonium salts and sulfonic acid groups onto the benzophenone core. The introduction of sulfonic acid groups onto the core is achieved through a sulfonation reaction.

[0003] A search revealed that Chinese patent application number 202310003495.2 discloses a method for preparing a water-soluble benzophenone-based ultraviolet absorber, the steps of which include:

[0004] 1) Mix 2,4-dihydroxybenzophenone, solid base catalyst, water-absorbing resin and solvent A to obtain a solution. Then, while stirring, add a mixed solution of 1,3-propanesulfonyl lactone and solvent B to the solution and carry out a reflux reaction.

[0005] 2) Filter the reaction system of step 1), remove the solvent under reduced pressure, then add water to dissolve it, extract it with a non-polar solvent at low temperature, and dehydrate the aqueous phase under reduced pressure to obtain a water-soluble ultraviolet absorber. The non-polar solvent is selected from at least one of cyclohexane, n-hexane, methylcyclohexane, dimethylcyclohexane, and diethyl ether, preferably diethyl ether.

[0006] Regarding the aforementioned technologies, the inventors believe that the following technical defects exist and require improvement:

[0007] In the process of extracting water-soluble ultraviolet absorbers using conventional equipment and diethyl ether, the extraction of the target substance mainly relies on the difference in solubility of the substance in the solvent and physical separation technology. The target compound is transferred from one solvent to another by repeated manual shaking, settling, and separation. The manual shaking amplitude is small and the number and frequency of shaking are uncontrollable, making it difficult for the target substance to dissolve quickly in the solvent. In addition, there is no structure for recovering diethyl ether, which is not conducive to the separation and recycling of diethyl ether. Summary of the Invention

[0008] This application provides a low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers to address the following technical problems:

[0009] In the process of extracting water-soluble ultraviolet absorbers using conventional equipment and diethyl ether, the extraction of the target substance mainly relies on the difference in solubility of the substance in the solvent and physical separation technology. The target compound is transferred from one solvent to another through repeated shaking, settling, and separation operations. The manual shaking amplitude is small and the number and frequency of shaking are uncontrollable, making it difficult for the target substance to dissolve quickly in the solvent. In addition, there is no structure for recovering diethyl ether, which is not conducive to the separation and recycling of diethyl ether.

[0010] This application provides a low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers, employing the following technical solution:

[0011] A low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers includes a mixture storage tank, a pump, a feed pipe, a sealed box, a separator, a telescopic sleeve, an oscillation assembly, a distillation recovery assembly, and a quantitative weighing assembly. One side of the mixture storage tank is fixedly connected to the input end of the pump via a pipe. The feed pipe is installed outside the output end of the pump and extends into the top inner side of the sealed box. The quantitative weighing assembly is installed at the lower end of the feed pipe's outlet. The telescopic sleeve is installed at the lower end of the quantitative weighing assembly. The separator is fitted inside the telescopic sleeve. The oscillation assembly is snapped onto the outside of the separator. The distillation recovery assembly is installed at the lower end of the telescopic sleeve.

[0012] The mixture storage tank is used to store the target mixture for extraction. The pump, in conjunction with the feed pipe, is used to draw the mixture inside the mixture storage tank under negative pressure into the interior of the quantitative weighing component. The quantitative weighing component is used for quantitative weighing of the mixture and the diethyl ether solution. The sealed box is used to provide a sealed environment for diethyl ether extraction. The oscillation component is used to shake the separatory funnel. The separatory funnel allows the diethyl ether and the mixture to naturally separate according to their density differences. The telescopic sleeve is used to flexibly connect the separatory funnel and prevent the separatory funnel from detaching from the telescopic sleeve during oscillation. The distillation recovery component is used to collect the diethyl ether organic phase and evaporate and recycle the diethyl ether in the organic phase.

[0013] In one feasible technical solution of this application, the oscillation assembly includes a fixed plate, a stepper motor, a connecting shaft, a cam, a swing frame, and a tension spring. The fixed plate is installed inside the sealed box, the stepper motor is installed outside the sealed box, the connecting shaft passes through the interior of one side of the sealed box and is fixedly connected to the motor shaft of the stepper motor via a coupling, the cam is installed outside the connecting shaft, one side of the swing frame abuts against the surface of the cam, and the tension spring is installed on the top side of the swing frame.

[0014] In one feasible technical solution of this application, the distillation recovery assembly includes a heating base, a heating container, a straight connecting pipe, and a serpentine condenser. The heating base is fixedly connected to the inside of the sealed box, the heating container is installed on the inner side of the heating base, one end of the serpentine condenser penetrates the top inner side of the heating container and is tightly fitted to the inner surface of the heating container, and the straight connecting pipe is installed at the upper end of the serpentine condenser and fixedly connected to the top side of the feed pipe.

[0015] In one feasible technical solution of this application, the quantitative weighing component includes a support plate, a feed hopper, a weighing sensor, and a support block. The bottom of the feed hopper is fixedly connected to the surface of the support block. The weighing sensor is installed at the lower end of the support block and fixedly connected to the surface of the support plate. One side of the support plate is fixedly connected to the inner surface of the sealed box.

[0016] In one feasible technical solution of this application, a clamping arm body is also installed on the inner side of the swing frame, and the vise end of the clamping arm body is in close contact with the outer wall surface of the liquid separator.

[0017] In one feasible technical solution of this application, a rotating shaft is also installed in the middle of the swing frame, and the rotating shaft is rotatably connected to the inner side of the sealed box.

[0018] In one feasible technical solution of this application, a small liquid pump is also provided at the bottom of the straight connecting pipe. The small liquid pump is used to return the condensed ether solution inside the serpentine condenser to the separatory funnel.

[0019] In one feasible technical solution of this application, the sealed box is further provided with an ether storage tank, an injection pipe and a small pump. One end of the injection pipe penetrates the interior of the ether storage tank and is in close contact with the surface of the ether storage tank, and the other side of the injection pipe is fixedly connected to the surface of the straight connecting pipe. The small pump is installed on one side of the injection pipe.

[0020] In one feasible technical solution of this application, a one-way valve is installed on the outside of both the injection tube and the straight connecting tube.

[0021] In one feasible technical solution of this application, an electric heating element is also installed on the inner side of the heating base, and the electric heating element is used to heat the heating container.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] This system is a fully automated extraction method. The mechanically stabilized shaking separatory funnel ensures thorough mixing and stratification of the mixture. The extraction process is carried out in a sealed chamber, preventing air from entering the chamber and preventing workers from inhaling ether, thereby increasing safety.

[0024] In addition, this system adds an ether distillation recovery structure after extraction. By successively pouring an appropriate amount of potassium permanganate and distilled water into the ether storage tank, the oxides inside the solution are removed. The clean ether is evaporated by the electric heating element and then liquefied through the serpentine condenser and returned to the separatory funnel, thereby achieving the purpose of separating, recycling and reusing the ether. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers, according to an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the structure of the oscillation component in the embodiments of this application.

[0028] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0029] Figure 4 This is a schematic diagram of the structure of the quantitative weighing component in the embodiments of this application.

[0030] Figure 5 This is a schematic diagram of the structure of the back of the sealed box in an embodiment of this application.

[0031] Figure 6 This is a distribution diagram of the electric heating elements in the embodiments of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Mixture storage tank; 2. Feed pump; 3. Feed pipe; 4. Sealed box; 5. Separating hopper; 6. Telescopic sleeve;

[0034] 7. Oscillating assembly; 71. Fixed plate; 72. Stepper motor; 73. Connecting shaft; 74. Cam; 75. Swing frame; 76. Tension spring;

[0035] 8. Distillation recovery assembly; 81. Heating base; 82. Heating container; 83. Straight connecting pipe; 84. Serpentine condenser;

[0036] 9. Quantitative weighing assembly; 91. Support plate; 92. Feed hopper; 93. Weighing sensor; 94. Support block;

[0037] 10. Clamping arm body; 11. Rotating shaft; 12. Small liquid pump one; 13. Ether storage tank; 14. Injection pipe; 15. Small liquid pump two; 16. Check valve; 17. Electric heating element. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0039] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0043] This application discloses a low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers. (Refer to...) Figures 1-6 A low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers includes a mixture storage tank 1, a pump 2, a feed pipe 3, a sealed box 4, a separator 5, a telescopic sleeve 6, an oscillation assembly 7, a distillation recovery assembly 8, and a quantitative weighing assembly 9. One side of the mixture storage tank 1 is fixedly connected to the input end of the pump 2 via a pipe. The feed pipe 3 is installed outside the output end of the pump 2 and extends into the top inner side of the sealed box 4. The quantitative weighing assembly 9 is installed at the lower end of the discharge port of the feed pipe 3. The telescopic sleeve 6 is installed at the lower end of the quantitative weighing assembly 9. The separator 5 is sleeved inside the telescopic sleeve 6. The oscillation assembly 7 is snapped onto the outside of the separator 5. The distillation recovery assembly 8 is installed at the lower end of the telescopic sleeve 6.

[0044] Mixture storage tank 1 is used to store the target mixture for extraction. Pump 2, in conjunction with feed pipe 3, is used to draw the mixture inside mixture storage tank 1 into the interior of quantitative weighing component 9 under negative pressure. Quantitative weighing component 9 is used for quantitative weighing of the mixture and the diethyl ether solution. Sealed box 4 is used to provide a sealed environment for diethyl ether extraction. Shaking component 7 is used to shake separatory funnel 5. Separatory funnel 5 allows diethyl ether and the mixture to naturally separate according to density differences. Telescopic sleeve 6 is used to flexibly connect separatory funnel 5 and prevent separatory funnel 5 from detaching from telescopic sleeve 6 during shaking. Distillation recovery component 8 is used to collect the diethyl ether organic phase and evaporate and recycle the diethyl ether in the organic phase.

[0045] The oscillation assembly 7 includes a fixed plate 71, a stepper motor 72, a connecting shaft 73, a cam 74, a swing frame 75, and a tension spring 76. The fixed plate 71 is installed inside the sealed box 4, the stepper motor 72 is installed outside the sealed box 4, the connecting shaft 73 passes through the interior of one side of the sealed box 4 and is fixedly connected to the motor shaft of the stepper motor 72 via a coupling, the cam 74 is installed outside the connecting shaft 73, one side of the swing frame 75 abuts against the surface of the cam 74, and the tension spring 76 is installed on the top side of the swing frame 75.

[0046] The distillation recovery assembly 8 includes a heating base 81, a heating container 82, a straight connecting pipe 83, and a serpentine condenser 84. The heating base 81 is fixedly connected inside the sealed box 4. The heating container 82 is installed inside the heating base 81. One end of the serpentine condenser 84 passes through the top inner side of the heating container 82 and is tightly fitted to the inner surface of the heating container 82. The straight connecting pipe 83 is installed at the upper end of the serpentine condenser 84 and is fixedly connected to the top side of the feed pipe 3.

[0047] The quantitative weighing assembly 9 includes a support plate 91, a feed hopper 92, a weighing sensor 93, and a support block 94. The bottom of the feed hopper 92 is fixedly connected to the surface of the support block 94. The weighing sensor 93 is installed at the lower end of the support block 94 and is fixedly connected to the surface of the support plate 91. One side of the support plate 91 is fixedly connected to the inner surface of the sealed box 4.

[0048] The inner side of the swing frame 75 is also equipped with a clamping arm body 10, and the vise end of the clamping arm body 10 is in close contact with the outer wall surface of the separator 5.

[0049] A rotating shaft 11 is also installed in the middle of the swing frame 75, and the rotating shaft 11 is rotatably connected to the inside of the sealed box 4.

[0050] A small liquid pump 12 is also installed at the bottom of the straight connecting pipe 83. The small liquid pump 12 is used to return the condensed ether solution inside the serpentine condenser 84 to the separatory hopper 5.

[0051] The sealed box 4 is also equipped with an ether storage tank 13, an injection pipe 14 and a small pump 15. One end of the injection pipe 14 passes through the interior of the ether storage tank 13 and is tightly attached to the surface of the ether storage tank 13. The other side of the injection pipe 14 is fixedly connected to the surface of the straight connecting pipe 83. The small pump 15 is installed on one side of the injection pipe 14.

[0052] One-way valves 16 are installed on the outside of both the injection pipe 14 and the straight connecting pipe 83.

[0053] An electric heating element 17 is also installed on the inner side of the heating base 81. The electric heating element 17 is used to heat the heating container 82.

[0054] The usage process of the low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers in this application embodiment is roughly as follows:

[0055] 1. After the target mixture is extracted and put into the mixture storage tank 1, the pump 2 is started to transport the mixture from the conveying pipe 3 to the inside of the feed hopper 92. The weighing sensor 93 located on the support plate 91 can weigh the mixture in real time to ensure accurate input.

[0056] 2. After weighing, open the discharge valve of the feed hopper 92. The mixture inside falls from the telescopic sleeve 6 into the separatory hopper 5. Then, turn on the small pump 15 above the ether storage tank 13 to pass the ether solution into the feed hopper 92 and weigh it. Then, put it into the separatory hopper 5.

[0057] 3. Start the clamping arm body 10 on both sides of the swing frame 75 to firmly clamp the inlet and outlet surfaces of the separator 5. Then, start the stepper motor 72 on the outside of the sealing box 4. Drive the cam 74 to rotate through the connecting shaft 73. The irregular protruding surface of the cam 74 fits against the bottom surface of the swing frame 75 when rotating. With the repeated stretching of the tension spring 76, the swing frame 75 and the rotating shaft 11 drive the separator 5 to oscillate repeatedly along the inside of the sealing box 4, thereby fully mixing the target substance and ether.

[0058] 4. Then let separatory funnel 5 stand for a period of time to allow the ether and the mixture to separate naturally according to their density differences;

[0059] 5. Since the density of diethyl ether is less than that of water, the diethyl ether layer is usually located on the upper layer. Then, open the discharge valve of separatory 5, first discharge the lower aqueous phase into diethyl ether storage tank 13 and then discharge it outdoors. Next, slowly release the diethyl ether layer and transfer it into diethyl ether storage tank 13. Then wash the organic phase solution with 0.5% potassium permanganate solution until the organic phase solution no longer fades to purple, in order to remove the oxides therein.

[0060] 6. Rinse the organic phase solution with distilled water to remove impurities such as potassium permanganate;

[0061] 7. Next, the electric heating element 17 in the heating base 81 is electrically activated to fully heat the heating container 82. At the same time, the small liquid pump 12 is started. The electric heating element 17 evaporates the clean ether and then liquefies it through the serpentine condenser 84 and flows back into the separatory hopper 5, thereby achieving the purpose of separating, recycling and reusing the ether.

[0062] The beneficial technical effects of the low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers in this application are roughly as follows:

[0063] This system is a fully automated extraction method. The mechanically stabilized shaking separatory funnel 5 ensures thorough mixing and stratification of the mixture. The extraction process is carried out in a sealed chamber 4, which prevents air from entering the chamber and prevents workers from inhaling ether, thereby increasing safety.

[0064] In addition, this system adds an ether distillation recovery structure after extraction. By successively pouring an appropriate amount of potassium permanganate and distilled water into the ether storage tank 13, the oxides inside the solution are removed. The electric heating element 17 evaporates the clean ether and then liquefies it through the serpentine condenser 84 and flows it back into the separatory hopper 5, thereby achieving the purpose of separating, recycling and reusing the ether.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers, characterized in that, The system includes a mixture storage tank (1), a pump (2), a conveying pipe (3), a sealed box (4), a separator (5), a telescopic sleeve (6), an oscillation assembly (7), a distillation recovery assembly (8), and a quantitative weighing assembly (9). One side of the mixture storage tank (1) is fixedly connected to the input end of the pump (2) via a pipe. The conveying pipe (3) is installed outside the output end of the pump (2) and extends into the top inner side of the sealed box (4). The quantitative weighing assembly (9) is installed at the lower end of the outlet of the conveying pipe (3). The telescopic sleeve (6) is installed at the lower end of the quantitative weighing assembly (9). The separator (5) is sleeved inside the telescopic sleeve (6). The oscillation assembly (7) is snapped onto the outside of the separator (5). The distillation recovery assembly (8) is installed at the lower end of the telescopic sleeve (6). The mixture storage tank (1) is used to store the target mixture for extraction. The pump (2) in conjunction with the feed pipe (3) is used to draw the mixture inside the mixture storage tank (1) into the interior of the quantitative weighing component (9) under negative pressure. The quantitative weighing component (9) is used for quantitative weighing of the mixture and the ether solution. The sealed box (4) is used to provide a sealed environment for ether extraction. The oscillation component (7) is used to shake the separatory funnel (5). The separatory funnel (5) is used for the ether and the mixture to naturally separate according to their density difference. The telescopic sleeve (6) is used to flexibly connect the separatory funnel (5) and prevent the separatory funnel (5) from detaching from the telescopic sleeve (6) when it is oscillating. The distillation recovery component (8) is used to collect the organic phase of ether and evaporate and recycle the ether in the organic phase. The oscillation assembly (7) includes a fixed plate (71), a stepper motor (72), a connecting shaft (73), a cam (74), a swing frame (75), and a tension spring (76). The fixed plate (71) is installed inside the sealed box (4), the stepper motor (72) is installed outside the sealed box (4), the connecting shaft (73) passes through the interior of one side of the sealed box (4) and is fixedly connected to the motor shaft of the stepper motor (72) by a coupling, the cam (74) is installed outside the connecting shaft (73), one side of the swing frame (75) abuts against the surface of the cam (74), and the tension spring (76) is installed on the top side of the swing frame (75). The quantitative weighing component (9) includes a support plate (91), a feed hopper (92), a weighing sensor (93), and a support block (94). The bottom of the feed hopper (92) is fixedly connected to the surface of the support block (94). The weighing sensor (93) is installed at the lower end of the support block (94) and fixedly connected to the surface of the support plate (91). One side of the support plate (91) is fixedly connected to the inner surface of the sealed box (4).

2. The low-temperature extraction system for industrial production of water-soluble benzophenone-based ultraviolet absorbers according to claim 1, characterized in that, The distillation recovery assembly (8) includes a heating base (81), a heating container (82), a straight connecting pipe (83), and a serpentine condenser (84). The heating base (81) is fixedly connected to the inside of the sealed box (4). The heating container (82) is installed on the inner side of the heating base (81). One end of the serpentine condenser (84) penetrates the top inner side of the heating container (82) and is tightly fitted to the inner surface of the heating container (82). The straight connecting pipe (83) is installed at the upper end of the serpentine condenser (84) and is fixedly connected to the top side of the feed pipe (3).

3. The low-temperature extraction system for industrial production of water-soluble benzophenone-based ultraviolet absorbers according to claim 1, characterized in that, The swing frame (75) is also equipped with a clamping arm body (10), and the vise end of the clamping arm body (10) is closely attached to the outer wall of the liquid separator (5).

4. The low-temperature extraction system for industrial production of water-soluble benzophenone-based ultraviolet absorbers according to claim 3, characterized in that, A rotating shaft (11) is also installed in the middle of the swing frame (75), and the rotating shaft (11) is rotatably connected to the inside of the sealing box (4).

5. The low-temperature extraction system for industrial production of water-soluble benzophenone-based ultraviolet absorbers according to claim 2, characterized in that, The bottom of the straight connecting pipe (83) is also provided with a small liquid pump (12), which is used to return the condensed ether solution inside the serpentine condenser (84) to the separatory funnel (5).

6. The low-temperature extraction system for industrial production of water-soluble benzophenone-based ultraviolet absorbers according to claim 5, characterized in that, The sealed box (4) is also equipped with an ether storage tank (13), an injection pipe (14) and a small pump (15). One end of the injection pipe (14) passes through the interior of the ether storage tank (13) and is tightly attached to the surface of the ether storage tank (13). The other side of the injection pipe (14) is fixedly connected to the surface of the straight connecting pipe (83). The small pump (15) is installed on one side of the injection pipe (14).

7. The low-temperature extraction system for the industrial production of water-soluble benzophenone-based ultraviolet absorbers according to claim 6, characterized in that, One-way valves (16) are installed on the outside of both the injection tube (14) and the straight connecting tube (83).

8. The low-temperature extraction system for industrial production of water-soluble benzophenone-based ultraviolet absorbers according to claim 2, characterized in that, An electric heating element (17) is also installed on the inner side of the heating base (81), and the electric heating element (17) is used to heat the heating container (82).

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